Diesel heater flue.

[noelex]

I am considering fitting a boat heater for this winter. A Taylors or Refleks diesel model..
The logical and probably only, location for the installation would position the flue exit under the dodger (fairly small and canvas)near the rear . The heater would mainly be used at anchor and therefore the flue would nominally be from in the lee of the dodger.
Any comments ? Will this will work?

 

[Deleted member 36384]

Beware Pressure Effects on the Flue By Being in a Lee

Hi Nolex - by dodger do you mean a spray dodger on the quarter or a spray hood at the front of the cockpit, or something else? Sorry if I am being thick here.

There is a risk when a flue is in the lee of an object of back eddies blowing down the flu, or stifling the draw in the flue. The result can be unpleasant smells, blow back or poor combustion. Most flues are designed to be in a free air flow when its windy to prevent this.

Examples from other flue types are gas boiler flue outlets being a specified distance from an object and traditional chimneys close to trees or extension gable ends. Normally the latter are specified to clear the highest part of an apex by a meter.

Perhaps a solution would be to have an extension piece which raised the flue up above the dodger when in use incorporating an offset if required. On my Alaskan flue it was possible to remove the cap and fit a blank when at sea i.e. the flue top piece was just a push fit into the flue extension from the heater.

My Alaskan was fitted into the forward heads locker with a cutaway in the bulkhead into the saloon for the glass front. The flue exited just forward of the mast, to one side. Maybe this can give you an idea.

Regards,

BlowingOldBoots

 

[Simes]

Hi Nolex,

I agree with B.O.B. the top of the Flue Stack does need to be in a place where there is little, or better, no disturbed air flow. It is possible to put one or two 45º bends in the flue stack. Most Diesel heaters also give a minimum height for the flue stack (Our Dickinson Antarctic is 4 feet and our Dickinson Adriatic is also 4 feet).

Check with www.karunda.co.uk for more info about Diesel heaters.

Simes